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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. template <typename UnaryFunction>
  5. class ApplyValues
  6. {
  7.     typedef std::function<UnaryFunction> Performer;
  8.     Performer performer;    
  9. public: 
  10.     typedef typename Performer::argument_type argument_type;
  11.  
  12.     ApplyValues( Performer p ) : performer( p ) { }
  13.  
  14.     void apply( argument_type low, argument_type up ) {
  15.         performer( low ); performer( up );
  16.     }
  17. };
  18.  
  19. void print(double value) {
  20.    std::cout << value << std::endl;
  21. }
  22.  
  23. struct print2 {
  24.    void operator()(double value) {
  25.       std::cout << 2 * value << std::endl;
  26.    }
  27. };
  28.  
  29. int main() {
  30.     using namespace std;
  31.  
  32.     ApplyValues<void(double)> a(print);
  33.     a.apply( 1, 99 );
  34.     cout << "---" << endl;
  35.     ApplyValues<void(double)> b( (print2()) );
  36.     b.apply( 2, 99 );
  37. }
Success #stdin #stdout 0s 3064KB
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stdin
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Standard input is empty
stdout
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1
99
---
4
198
https://ideone.com/6CdZr
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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